Nguyễn Đức Rỡi

Main Article Content

Abstract

Abstract: Estimation of groundwater recharge from rainfall is a key factor for determining groundwater resources in water development and management. The paper presents application of rainfall infiltration breakthrough (RIB) model method for groundwater Holocene aquifer recharge estimation for Hưng Yên province in the Red RiverDelta,Vietnam. Although monitoring Holocene aquifer water level (WL) data are from different hydrogelogical either nearly naturally undisturbed or groundwater disturbed abstraction conditions, the relationship between the groundwater level fluctuation and cumulative rainfall departure is of a good match. The groundwater monitoring wells of the national monitoring network have been used are QT119, QT129 and QT130. The fractions of cumulative rainfall departure are from 13% for monitoring well QT119, and 12%-16% for wells QT129 and QT130. For the basic case of specifice yield of 0.1, the rainfall recharge rates are from 427mm (34.1% of mean annual rainfall) in the monitoring well QT119 area to 527mm (38.1% of mean annual rainfall) the area of monitoring wells QT129 and QT130 area. This recharge rates already include the evapotranspiration from the groundwater, which may be more or less than 50% of the total recharge rate and other possible discharge. Therefore, the obtained effective recharge is lightly greater then the range of 15%-20% of rainfall which is commonly used by theVietnamhydrogeologists.

Keywords:Red River Delta, Cumulative Rainfall Departure (CRD), Rainfall Infiltration Breakthrough (RIB), Groundwater Recharge, Pearson Correlation, Spearman Correlation.

References

[1] Nguyen Duc Roi, 2009. Report on groundwater resources utilization planning of Hung Yen province upto 2020. Hung Yen DoNRE (in Vietnamese).
[2] X Sun, Y Xu, NZ Jovanovic, E Kapangaziwiri, L Brendonck and RDH Bugan, 2013. Application of the rainfall infiltration breakthrough (RIB) model for groundwater recharge estimation in west coastal South Africa. ISSN 1816-7950 (On-line), Water SA Vol. 39 No. 2 April 2013.
[3] Chau Van Quynh, 1996. Report on groundwater exploitation exploration of Cam Giang- Hai Duong and My Van- Hung Yen area. Department of geology and mineral resources-MoNRE (in Vietnamese).
[4] Chau Van Quynh, Nguyen Thi Tam, 1998. Report on groundwater exploitation exploration of Hung Yen town. Department of geology and mineral resources-MoNRE (in Vietnamese).
[5] Phan Xuan Hai, 1984. Report on groundwater exploration of An Thi area-Hung Yen scale 1:50,000. Department of geology and mineral resources-MoNRE (in Vietnamese).
[6] Nguyen Thi Ha, 2010. Report on groundwater monitoring system of Hung Yen province. Hung Yen DoNRE (in Vietnamese).
[7] Kinzelbach W., Aeschbach W., Alberich C., Goni I.B., Beyerle U., Brunner P., Chiang W.-H., Rueedi J., and Zoellmann K., 2002. A Survey of Methods for Groundwater Recharge in Arid and Semi-arid regions. Early Warning and Assessment Report Series, UNEP/DEWA/RS.02-2. United Nations Environment Programme, Nairobi, Kenya. ISBN 92-80702131-3).
[8] Bredenkamp DB, Botha LJ, Van Tonder GJ and Van Rensburg HJ, 1995. Manual on Quantitative Estimation of Groundwater Recharge and Aquifer Storativity. WRC Report No. TT 73/95. Water Research Commission, Pretoria.
[9] XU Y and VAN TONDER GJ, 2001. Estimation of recharge using a revised CRD method. Water SA 27 (3) 341–344.
[10] Dang Huu On, Bach Ngoc Quang, Dao Van Quang, 2007. Determination of rainfall recharge to groundwater at Nhu Quynh groundwater balance polygon. Journal of Geology, No. 300/5-6/2007, pp. 50-56 (in Vietnamese).